mysql parameterized query in ASP.NET

问题

i am working on parameterized queries but i am not getting proper query in result

here is my code

   public MySqlCommand Get_Login(string clinetID, string loginID, string password, string branchID)
    {
        MySqlCommand objCommand = new MySqlCommand(this.Query);


        objCommand.Parameters.AddWithValue("@ClientID", clinetID);
        objCommand.Parameters.AddWithValue("@LoginID", loginID);
        objCommand.Parameters.AddWithValue("@Password", password);
        objCommand.Parameters.AddWithValue("@BranchID", branchID);

        objCommand.CommandType = CommandType.Text;
        return objCommand;
    }

and when debugging this is what i am getting in "objCommand"

 Select u.groupid,p.PersonId, p.designationid,concat(p.salutation,p.FName,'
',p.MName,' ',p.LName) as PersonName,tb.Type
 BrType,p.OrgId,p.subdepartmentid,ifnull(crossdept,'N') as
 crossdept,p.departmentid,u.defaultpage,p.orgid,ifnull(p.crosslab,'N') as crosslab,
 (select indoor_services from dc_Tp_organization where orgid='@ClientID') as
 indoor_services,(select name from dc_Tp_organization where orgid='@ClientID') as 
 orgname,
 (select default_route from dc_Tp_organization where orgid='@ClientID') as
 default_route,p.BranchID BranchID,tb.Name BRName from dc_tp_personnel p left outer
  join
 dc_tu_userright u on u.personid=p.personid left outer join dc_tp_branch tb on
 tb.BranchID=p.BranchID Where p.Active='Y' and p.LoginId = '@LoginID' and p.Pasword
  ='@Password' and p.BranchID='@BranchID'

i am not getting values in parameters

Here is the Query

objdbhims.Query = "Select u.groupid,p.PersonId,
p.designationid,concat(p.salutation,p.FName,' ',p.MName,' ',p.LName) as 
PersonName,tb.Type BrType,p.OrgId,p.subdepartmentid,ifnull(crossdept,'N') as 
crossdept,p.departmentid,u.defaultpage,p.orgid,ifnull(p.crosslab,'N') as crosslab,
(select indoor_services from dc_Tp_organization where orgid=@ClientID) as
indoor_services,(select name from dc_Tp_organization where orgid=@ClientID) as
orgname,(select default_route from dc_Tp_organization where orgid=@ClientID) as
 default_route,p.BranchID BranchID,tb.Name BRName from dc_tp_personnel p left outer
join dc_tu_userright u on u.personid=p.personid left outer join dc_tp_branch tb on
tb.BranchID=p.BranchID Where p.Active='Y' and p.LoginId = @LoginID and p.Pasword
=@Password and p.BranchID=@BranchID";

回答1:

Secret Squirrel was correct on using the "?" for parameterized variables. MySQL uses "@" for inline sql variables for queries and thus expecting them to be declared such as from a script or part of an inline (select subquery) declaration.

You need to change BOTH instances of the parameters... both in the query, and as the command.Parameters.Add... instances.

Also, I noticed, and not sure if its it or not, but in your WHERE clause you have "pasword" (only one 's') vs password (two 's') Don't know if intentional or not.

One LAST thing that MAY help. Since some of the parameters match the column names, I would suggest changing the parameters SLIGHTLY by just adding something like "x" to FORCE differentiation between the column name and the actual parameters...

where... p.LoginID = ?xLoginID ...

and in the command parameters

objCommand.Parameters.AddWithValue("?xLoginID", loginID);

回答2:

The problem is because the parameters were wrap with single quotes converting them into string literals.

To make it work, remove the single quotes around them. eg.

Where p.Active = 'Y' 
      and p.LoginId = @LoginID 
      and p.Pasword = @Password
      and p.BranchID = @BranchID

来源：https://stackoverflow.com/questions/20520279/mysql-parameterized-query-in-asp-net

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